Switch to FunctionImplementations.jl

[mtfishman]

To-do:

• Bring back and test cat (requires adding concatenate back to FunctionImplementations.jl).
• Code cleanup.
• Rename [abstract]sparsearrayinterface.jl to [abstract]sparsearraystyle.jl.
• Change diag_style function signatures from Diagonal to AbstractMatrix.

Closes #82, closes #83.

[codecov]

Codecov Report

❌ Patch coverage is 85.62874% with 24 lines in your changes missing coverage. Please review.
✅ Project coverage is 78.95%. Comparing base (4ae766b) to head (d583277).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
src/map.jl	65.21%	8 Missing ⚠️
src/abstractsparsearray.jl	83.87%	5 Missing ⚠️
src/abstractsparsearraystyle.jl	42.85%	4 Missing ⚠️
src/indexing.jl	94.54%	3 Missing ⚠️
src/sparsearraystyle.jl	91.42%	3 Missing ⚠️
src/wrappers.jl	92.85%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #81      +/-   ##
==========================================
+ Coverage   77.59%   78.95%   +1.35%     
==========================================
  Files          12       12              
  Lines         732      784      +52     
==========================================
+ Hits          568      619      +51     
- Misses        164      165       +1     

Flag	Coverage Δ
docs	30.54% <43.35%> (+1.54%)	⬆️

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